Which of the following functions is decreasing on \( \left(0, \frac...

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Which of the following functions is decreasing on \( \left(0, \frac{\pi}{2}\right) \)
\( \mathrm{P} \)
(A) \( \sin 2 x \)
(B) \( \tan x \)
(C) \( \cos x \)
(D) \( \cos 3 x \)
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